占線。Dropped the call.

喂？Hello? Baijie speaking.Hello? This is Baijie.

請問你是？Excuse me, who is this?May I ask who's calling, please.

對不起，你打錯了。I'm sorry. You've dialed the wrong number.

我可以和…通話嗎？May I please speak with Ms. Bai?Can I please have extension 552?Is Baijie there?

留個信息…I'd like to leave a message.Would you like to leave a message?Can I take a message for you?

等一下，有人打過來…Hold on, I'm getting another call.Hey! Can you hold on one sec?Hey, I gotta call you back. I'm getting another call.Can I call you right back? I've got to take this call.